112 lines
3.4 KiB
Dart
112 lines
3.4 KiB
Dart
// lib/services/gnss/ble_gnss_connection.dart
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import 'dart:async';
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import 'package:flutter_blue_plus/flutter_blue_plus.dart';
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import 'gnss_connection.dart';
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// Nordic UART Service — a legelterjedtebb BLE UART profil
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const _nusServiceUuid = '6e400001-b5b3-f393-e0a9-e50e24dcca9e';
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const _nusTxCharUuid = '6e400003-b5b3-f393-e0a9-e50e24dcca9e'; // notify
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const _nusRxCharUuid = '6e400002-b5b3-f393-e0a9-e50e24dcca9e'; // write
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class BleGnssConnection implements GnssConnection {
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@override
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GnssConnectionType get type => GnssConnectionType.ble;
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final String serviceUuid;
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final String txCharUuid; // notify (eszköz → telefon)
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BleGnssConnection({
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this.serviceUuid = _nusServiceUuid,
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this.txCharUuid = _nusTxCharUuid,
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});
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BluetoothDevice? _device;
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StreamSubscription? _notifySub;
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String _lineBuffer = '';
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final _nmeaController = StreamController<String>.broadcast();
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final _stateController = StreamController<GnssConnectionState>.broadcast();
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@override
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Stream<String> get nmeaLines => _nmeaController.stream;
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@override
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Stream<GnssConnectionState> get connectionState => _stateController.stream;
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@override
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Future<void> connect(String address) async {
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_stateController.add(GnssConnectionState.connecting);
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try {
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_device = BluetoothDevice.fromId(address);
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await _device!.connect(
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timeout: const Duration(seconds: 10),
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autoConnect: false,
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license: License.free);
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// Kapcsolat megszakadás figyelése
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_device!.connectionState.listen((state) {
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if (state == BluetoothConnectionState.disconnected) {
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_stateController.add(GnssConnectionState.disconnected);
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}
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});
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// Service discovery
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final services = await _device!.discoverServices();
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final gnssService = services.firstWhere(
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(s) => s.serviceUuid.str.toLowerCase() == serviceUuid.toLowerCase(),
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orElse: () =>
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throw Exception('GNSS service nem található: $serviceUuid'),
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);
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// TX karakterisztika (notify) — eszköztől jönnek az NMEA sorok
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final txChar = gnssService.characteristics.firstWhere(
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(c) =>
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c.characteristicUuid.str.toLowerCase() == txCharUuid.toLowerCase(),
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orElse: () => throw Exception('TX char nem található: $txCharUuid'),
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);
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// Notify engedélyezése
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await txChar.setNotifyValue(true);
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_notifySub = txChar.onValueReceived.listen(_onBleData);
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_stateController.add(GnssConnectionState.connected);
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} catch (e) {
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_stateController.add(GnssConnectionState.error);
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rethrow;
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}
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}
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void _onBleData(List<int> bytes) {
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// BLE csomagok kis méretűek (≤20 byte MTU default),
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// az NMEA mondatokat össze kell fűzni
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final chunk = String.fromCharCodes(bytes);
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_lineBuffer += chunk;
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// Teljes sorok kibocsátása
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while (_lineBuffer.contains('\n')) {
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final idx = _lineBuffer.indexOf('\n');
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final line = _lineBuffer.substring(0, idx).trim();
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_lineBuffer = _lineBuffer.substring(idx + 1);
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if (line.isNotEmpty) _nmeaController.add(line);
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}
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}
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@override
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Future<void> disconnect() async {
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await _notifySub?.cancel();
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await _device?.disconnect();
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_stateController.add(GnssConnectionState.disconnected);
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}
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@override
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void dispose() {
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_notifySub?.cancel();
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_device?.disconnect();
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_nmeaController.close();
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_stateController.close();
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}
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}
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